With the current low prices for servers and the need for processing power, even a small company may end up with quite a few of them. If ten years ago it was still common to see an entire company using just one server, these days that's no longer the case.
New computers are added to the network with the understanding that they will be taken care of by the admins. Keeping an eye on these servers is a tedious, time-consuming process. Even with 5 minutes per server (to check the logs and other parameters), it may take an hour to make sure that everything is ok and no "red lights" are blinking on any of the servers.

Description:A non-expirable message with the internal message ID 1048104 could not be categorized. This message may be a journal report or other system message. The message will remain in the queue until administrative action is taken to resolve the error. Other messages may also have encountered this error. To further diagnose the error use the Queue Viewer or the Mail Flow Troubleshooter.

Comments:EventID.Net
According to MSEX2K3DB, this Warning event indicates that a journal report that was sent to a journaling mailbox has been rejected. The article provides several suggestions on how to fix it.